21020525200 has 120 divisors (see below), whose sum is σ = 51571872800. Its totient is φ = 8231777280.

The previous prime is 21020525161. The next prime is 21020525203. The reversal of 21020525200 is 252502012.

It is not an unprimeable number, because it can be changed into a prime (21020525203) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4056211 + ... + 4061389.

Almost surely, 2^21020525200 is an apocalyptic number.

21020525200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21020525200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25785936400).

21020525200 is an abundant number, since it is smaller than the sum of its proper divisors (30551347600).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21020525200 is a wasteful number, since it uses less digits than its factorization.

21020525200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5409 (or 5398 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 19.

The spelling of 21020525200 in words is "twenty-one billion, twenty million, five hundred twenty-five thousand, two hundred".